Electric-resistance conductor.



YORK, AS SIGNOR TO GENERAL ELECTRIC NY, A CORPORATION OF NEW YORK. ELE OTRIC-RESISTANCE CONDUCTOR.

Specification 0! Letters Patent; Patented Oct. 20, 1908. Application filed November 4, 1907. Serial No. 400,691, I i To all whom it may concern:

drawn into extremel I e wire or ribbon having a resistivity of 117 microhms per cubic centimeter or 70 times that of we copper. be prepared n a an oil mace, and ordinary way by rolling Be it known that I, JOHN-T. H. a citizen of the 5 far as it is limited by t laims annexed hereto. at I claim as new. and desire to secure a by etters Patent of t It ture and is very acid proof, bein insoluble 1n even concentrated mineral aci s, boiling stron aqua regia bein required for its solution. t has ahigh elec.

o c 7 iron, nickel, chrocontent exceeding a 0y containing iron, nickel, chrotr1cal res1st1 vity, which adapts 1t well'for mium, and a manganese content exceeding electric heating and rheostat work since it 3%, the nickel beinginexcess of the other 1nwithstands a red heat for a long continued I gredients. service, and although under such conditions 3. An alloy containing iron, nickel, chro- 1 0x1 lzes slowly the OXld 1s coherent and mium, and a manganese content exceeding oes not materially change its conductivit 3%, the iron and nickel being severally in exthe bes composition I have thus far cess of the other ingredients. used, the alloy is composed approximately of alloycontaining nickel, lion, chromium and a manganese content 0 approxi- 35 parts (by Y?, f f* ma'teli 5%, the iron content not exceeding (z 4 g a g 5. An alloy containing nickel, iron, chromangan mium, and a manganese content of approxl- The manganese is lpresent in a sufiiciently mately 5%, the nickel being in excess of the large proportion to end lts properties as a other ingredients. metal, the amount being more than suffialloy containing nickel, chromium, cient to aid in theformation of the alloy and an iron content exceeding 10% and not alloy containing exceeding 50%.

' -7. An alloy containing nickel chromium 35 parts (by li 323 and an iron content of approximately 20%. 12'630 chroml-um In witness whereof, I have hereunto set my' 4:910 manganesj hand this 2nd day of November, 1907. .130 silicon, JOHN T. H. DEMPSTER. .040 carbon, l 1tnesses: fP BENJAMIN -B. HULL,

, ELEN ORFORD. 

